Process of making carbon-black.



515; 866,883. PATENTED SEPT. 24, 1907.

v A. D. PURTLE & I. B. ROWLAND.

PROCESS OF MAKING CARBON BLACK.

APPLICATION FILED 0110.11. 1906.

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A TTOIIGNLIYS UNITED STATES PATENT OFFICE. I

ALBERT D. PURTLE AND IRVEN E. ROWLAND, OF SALEM, WEST VIRGINIA.

PROCESS OF MAKING CARBON-BLACK.'

Specification of Letters Patent.

Patented Sept. 24,1907.

E. ROWLAND, citizens of the United States, residing at Salem, in thecounty of Harrison and State of West Virginia, have invented a new anduseful Process of Making Carbon-Black, of which the following is aspecification.

This invention relates to the manufacture of carbon black to be used inthe process of making pigments, ink and the like, and has for itsprincipal object to'produce the carbon black by a continuous process.

A further object of the invention is to provide a continuous process forthe manufacture of a flocculent unctuous carbon black having a slightbluish tinge which may be used for painting or in the manufacture offiner grades of so called India ink.

A still further object of the invention is to provide a process in whicha hydro carbongas under pressure is subjected to the action of heat in aclosed retort.

With these and other objects in view, as will more fully hereinafterappear, the invention consists in certain novel features of constructionand arrangement of parts, hereinafter fully described, illustrated inthe accompanying drawings, and. particularly pointed out in the appendedclaims, it being understood that various changes in the form,proportions, size and minor details of the structure may be made withoutdeparting from the spirit or sacrificing any of the advantages of theinvention. v

The drawing illustrates in vertical section an apparatus for themanufacture of carbon black constructed and arranged in accordance withthe invention.

In the drawing 10 indicates a suitable furnace or combustion chamber,within which is arranged a cylindrical retort 11, a number of suchretorts being preferably arranged within a single combustion chamber andthe opposite ends of each retort projecting beyond the walls of suchchamber.

Leading to the retort is a pipe 15 through which gas, preferably naturalgas, is forced under pressure, it being found that'a pressure of tenpounds secures good results, although both higher and lower pressureshave been used in practice. The pipe 15 is provided with a. controllingvalve 16 through which the gas must pass before it enters the retort,and leading from the pipe is a branch pipe 17, also provided with acontrolling valve 18. The branch pipe 17 leads to burner pipe 19arranged below the retort 11 and provided with perforations for thepassage of the jets of gas to be used in heating the retort, provisionbeing made for introducing a suitablequantity of air as by means of aBunsenburner air-inlet, indicated at 26.

' At the entrance end' of the retort is a detachable head 20 having astufiing box 21 through which passes a rod 22 carrying a scraper 23which is used for the purpose of forcing the deposited carbon black outof the rear end of the retort from whence it falls through a valveddischarge pipe '25 and is conveyed away to the storage or packing room.

In practice the valve of the pipe 25is closed while the valves 16 and 18are opened, a sufficient quantity of gas passing through the burner tubeto heat the retort to the proper temperature, the retort beingpreferably heated to a bright cherry red or approximately eight hundreddegrees centigrade. The carbon'of the gas under pressure entering theretort is deposited within the retort in the'form of carbon black, andat frequent,

intervals the scraper 23 is forced through the retort in order to conveyaway the carbon black from the heat zone before anydeterioration fromburning can occur, the valve in the discharge pipe being'open atintervals to permit the accumulated carbon black to discharge.

The process is to all intents and purposes a continuous one in that itis not necessary to stop operations except momentarily to open the valveof the discharge pipe, and it is never necessary to allow the retort tocool-for the removal of the product.

1. The process of producing carbon black froma hydrocarbon gas whichconsists in heating the gas in aclosed retort to such a degree as todecompose the gas and cause the carbon to be deposited on the interiorwalls of the retort in a flocculent condition, and then removing the canhon while still in the flocculent state and without cooling the retort.

2. The process of producing carbon black from a hydrocarbon gasconsisting in subjecting-the gas under pressure in a closed retort to aheat of about 800 degrees contigrade until the carbon is deposited onthe interior Walls oi the retort in a fiocculent condition, and thenremoving the carbon from the retort while still in the fiocculent state.

3. The process of producing carbon'hlacl: from a hydrocarbon gasconsisting in continuously introducing the gas: under pressure into aclosed retort heated to a temperature suflicient to cause the depositionof the carbon of the gas in a flocculent state upon the interior wallsof the retort, and then removing the deposited carbon from time to timewhile still in the floeculent state and without reducing the heat of theretort.

4. The process of producing carbon biacis from a hydro carbon gasconsisting in subjecting the gas under pressure in a closed retort tothe action of heat until the carbon is separated therefrom and depositedin a fiocculent condition in the retort, and then removing the depositedcarbon while still in the fiocculent state, from the heat zone.

In testimony that We claim the foregoing as our own, we have heretoaffixed our signatures in the presence of two witnesses.

ALBERT D. PURTLE. IRVEN E. ROWLAND. Witnesses OSCAR C. WILT, 0. F.MORRISON.

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